High-Efficiency Near-Infrared Fluorescent Organic Light-Emitting Diodes with Small Efficiency Roll-Off: A Combined Design from Emitters to Devices
作者:Jie Xue、Qingxin Liang、Yunge Zhang、Ruoyun Zhang、Lian Duan、Juan Qiao
DOI:10.1002/adfm.201703283
日期:2017.12
The simultaneous realization of high quantum yield and exciton utilizing efficiency (ηr) is still a formidable challenge in near‐infrared (NIR) fluorescent organic light‐emitting diodes (FOLEDs). Here, to achieve a high quantum yield, a novel NIR dye, 4,9‐bis(4‐(diphenylamino)phenyl)‐naphtho[2,3‐c][1,2,5]selenadiazole, is designed and synthesized with a large highest occupied molecular orbital/lowest
在近红外(NIR)荧光有机发光二极管(FOLED)中,同时实现高量子产率和激子利用效率(ηr)仍然是一个艰巨的挑战。在这里,为了获得高量子产率,设计并合成了一种新型的NIR染料4,9-双(4-(二苯基氨基)苯基)萘[2,3- c ] [1,2,5]硒代二唑。最大的占据分子轨道/最小的未占据分子轨道重叠以及聚集诱导的发射特性,这表明在甲苯中在743 nm处的光致发光量子产率高,在743 nm处在723 nm处的光致发光量子产率为29%。对于高ηr,选择发射橙色的热激活延迟荧光材料1,2-双(9,9-二甲基-9,10-二氢ac啶)-4,5-二氰基苯作为敏化宿主,以收集装置中的三重态激子。经过优化的器件在730 nm处的ηr为45.7%,外部量子效率高达2.65%,在200 mA cm -2时的效率滚降非常小,仅为2.41%,这是最有效的值之一适用于700 nm以上的NIR-FOLED。通过热活